How to extract values from large string?

Question

5.00/5 (1 vote)

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Hi everyone,

I have come against a scenario where i have to extract all values where it occurs in a large string. For example:

C#

string longString = "val{1}:val{5}/val{10}";

So i want to extract all values that occur where val{ };

The result should be:
1
5
10

I have been trying to do this using indexOf but with not much luck. What would be easy way to accomplish this?

I'd appreciate any advice! :)

Posted 15-Sep-15 19:16pm

Silver13

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Comments

Matt T Heffron 16-Sep-15 13:33pm

What additional constraints are there on the string?
E.g., Will the values always be positive integers? Or could there be negative numbers or real values?
Could digit characters occur anywhere else in the string, outside of val{}? Should those be ignored?
Will you also need to do other processing of the string (so doing it all at once may be more efficient)?
...

Silver13 16-Sep-15 19:33pm

The numbers are always going to be inside val{} for this scenario.
The target is to get those numbers inside. The only other constrain for this would to ignore zeros.

5 solutions

Solution 1

Hello ,
Try this way

string longString = "val{124}:val{50}/val{100}";
		//first split the string into two parts from semicolon
		string[] sp=longString.Split(':');
		
		//then get the first part by using substring , here 1234
		
		Console.WriteLine("First Part is " + sp[0].ToString().Substring(4,sp[0].ToString().Length-5));
		
		
		//again split the first array into two parts 
		string second=sp[1].ToString() ;
		string[] secondarrary=second.Split('/'); 
		
		//Now get second and third part using substring 
		Console.WriteLine("Second Part is " + secondarrary[0].ToString().Substring(4,secondarrary[0].Length-5));
		Console.WriteLine("Third  Part is " + secondarrary[1].ToString().Substring(4,secondarrary[1].Length-5));

and OP is

First Part is 124
Second Part is 50
Third  Part is 100

Posted 15-Sep-15 19:52pm

Animesh Datta

Solution 2

add the reference

using System.Text.RegularExpressions;

Then add the following code

string[] numbers = Regex.Split("val{1}:val{5}/val{10}", @"\D+").Where(x => !string.IsNullOrEmpty(x)).ToArray();

And finally you will get a string array which will contain all the numbers

Posted 15-Sep-15 20:19pm

Tirujit

Updated 15-Sep-15 20:23pm

v2

Solution 5

So, based on your answer to my questions above:

C#

// create the Regex only once!
private static readonly Regex ValContents = new Regex("val{([^}]+)}", RegexOptions.Compiled);
// in the appropriate method:
string longString = "val{1}:val{5}/val{10}";
MatchCollection matches = ValContents.Matches(longString);
List<string> values = matches.Cast<Match>().Select(m => m.Groups[1].Value).ToList();

This will return a list of all of the content of each val{} as a string.
If you want it to ignore any val{} content that is not simply digits, then change the Regex string to: "val{(\d+)}"

Posted 16-Sep-15 14:18pm

Matt T Heffron

Solution 4

C#

str = "val{1}:val{5}/val{10}";
      StringBuilder sb = new StringBuilder(str);
      sb = sb.Replace("val{", string.Empty)
      .Replace("val{", string.Empty)
      .Replace("}:", ",")
      .Replace("}/", ",")
      .Replace("}", string.Empty);
       Console.Write( sb.ToString());

Posted 15-Sep-15 20:46pm

Raghunatha_Reddy_S

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Thanks7872 · Accepted Answer · 2015-09-15T20:33:00

Solution 3

C#

string longString = "val{1}:val{5}/val{10}";
var Digits = Regex.Matches(longString, "[0-9]+");
List<string> LstDigit= new List<string>();
foreach (Match Digit in Digits)
{    
    LstDigit.Add(Digit.ToString());
}

Regards..

Posted 15-Sep-15 20:33pm

Thanks7872

Updated 15-Sep-15 20:34pm

v2

Comments

Silver13 16-Sep-15 19:34pm

Pretty straight forward. I always underestimate the power of Regex. This is a great solution!